FFMPEG SoundSource does not do sample accurate seeks

[Waylon Robertson]

OGG files do not render or play correctly, they sound like they are being played at slow slow rate, with empty samples in between, and on the waveform, it gets truncated. The log:
Debug [AnalyserQueue 1]: ffmpeg: libavcodec 'avcodec_decode_audio4' didn't succeed or frame not finished (File could also just end!)
Debug [AnalyserQueue 1]: ffmpeg: libavcodec 'av_read_frame' didn't succeed!
Debug [AnalyserQueue 1]: ffmpeg: Too less bytes 10240 needed 16384
Debug [AnalyserQueue 1]: ffmpeg: libavcodec 'av_read_frame' didn't succeed!
Debug [AnalyserQueue 1]: ffmpeg: Too less bytes 0 needed 16384

Works in Xine.

Using Ubuntustudio 13.10 64bit

[Waylon Robertson (wrobertson1981)]

Effects Mixxx 1.12 alpha pre x64

[Owen Williams (ywwg)]

is the file stereo? mono? other?

[Waylon Robertson (wrobertson1981)]

Stereo

[RJ Skerry-Ryan (rryan)]

As we discovered this is a problem with SoundSourceFFMPEG. We need to build seek tables or something similar to how we do with SSMP3.

[Tuukka Pasanen (pasanen-tuukka)]

Hmm.. actually FFMPEG has this table all ready because it's turned on. I'll get on this now I have more time.. I need little more specific usage example and what version of FFMPEG is used?

[RJ Skerry-Ryan (rryan)]

@Tuukka -- cool, thank you!

[Tuukka Pasanen (pasanen-tuukka)]

This seems to be more FFMPEG inner thing. That is little bit bad and this is going to take a while to find a workaround. @rryan Can you mark FFMPEG broken again because in current state it's next to nothing and I don't know can I get fix before Beta.

[Tuukka Pasanen (pasanen-tuukka)]

Now there is branch that should fix this issue for good: https://github.com/illuusio/mixxx/tree/ffmpeg-fix
Biggest problem currently is speed of seek it takes too long that human can notice it and also make this work on older FFmpeg and Avconv versions.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/7329